Virtual Dual-Phase Steel Modeling and Its Experimental Verification
by Combination Method and Crystal Plasticity Finite Element Method

Abstract

In this study, the dynamic explicit elastic crystal viscoplastic finite element analysis code and combination method were employed to model a dual-phase steel sheet for a newly developed texture design system. The dual-phase steel consisted of martensite and ferrite phases. The crystal orientation distributions of the ferrite and martensite phases were measured by EBSD (Electron Back Scatter Diffraction Camera) and ODF (Orientaion Distribution Function) analyses, and the hardening evolutions of the two phases were identified by uni-axial tensile tests. By employing the combination algorithm to compound the two phases, FE models for assessing plastic anisotropy and formability were obtained. The feasibility of our finite element modeling scheme was verified by comparing the deformation and strain distributions in square-cup deep drawing and VDI benchmark stretch-draw experiments.